Initial work on iterators, rework of variable handling by including actual string

src/Evaluator/Iterator/Iterator.hpp

@@ -0,0 +1,43 @@
+
+#ifndef PORYGONLANG_ITERATOR_HPP
+#define PORYGONLANG_ITERATOR_HPP
+
+#include <memory>
+#include "../EvalValues/EvalValue.hpp"
+#include "../EvalValues/TableEvalValue.hpp"
+#include "../EvalValues/StringEvalValue.hpp"
+
+using namespace std;
+
+namespace Porygon::Evaluation{
+    class Iterator {
+    public:
+        virtual shared_ptr<EvalValue> GetCurrent() = 0;
+        virtual bool MoveNext() = 0;
+        virtual void Reset() = 0;
+    };
+
+    class TableKeyIterator : Iterator{
+        _Rb_tree_const_iterator<pair<const Utilities::HashedString, shared_ptr<EvalValue>>>  _iterator;
+        _Rb_tree_const_iterator<pair<const Utilities::HashedString, shared_ptr<EvalValue>>>  _end;
+    public:
+        TableKeyIterator(shared_ptr<TableEvalValue> table)
+            : _iterator(table->GetTableIterator()), _end(table->GetTableIteratorEnd()){}
+
+        shared_ptr<EvalValue> GetCurrent() final{
+            return make_shared<StringEvalValue>(_iterator->first.GetString());
+        }
+
+        bool MoveNext() final{
+            std::advance(_iterator, 1);
+            return _iterator != _end;
+        }
+
+        void Reset(){
+            throw EvaluationException("Can't reset table key iterator");
+        }
+    };
+}
+
+
+#endif //PORYGONLANG_ITERATOR_HPP